US5372162A - Repair device for the in situ repair of pipes, and a method of repairing pipes - Google Patents

Repair device for the in situ repair of pipes, and a method of repairing pipes Download PDF

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Publication number
US5372162A
US5372162A US08/026,976 US2697693A US5372162A US 5372162 A US5372162 A US 5372162A US 2697693 A US2697693 A US 2697693A US 5372162 A US5372162 A US 5372162A
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repair device
pipe
inflatable
inflatable members
repair
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US08/026,976
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English (en)
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Andre F. Frey
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/1645—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe

Definitions

  • This invention relates to the repair of pipes or other conduits (hereinafter simply referred to as pipes) which are not directly accessible from the outside and which cannot be examined from within because they are too small. More particularly, the invention relates to a device for the in situ repair of such pipes, and also to a method of repairing such pipes.
  • Devices for the in situ restoration of inaccessible pipes by injecting a filler product are known, in particular devices which comprise one or more modules which have a cylindrical shape and a variable diameter, and are introduced into the pipe, and are then drawn along therein.
  • these devices can only restore those sections of the pipe that are situated between two manholes, the first manhole being used for the introduction of the device, and the second one for drawing it along by means of a cable or pulling chain. Furthermore, it is not possible to use these devices in pipes which have substantial shoulders or internal projections.
  • U.S. Pat. No. 4,429,720 describes a continuous flexible tubular body, comprising an inflatable front part and an inflatable rear part, which parts, between them, define an injection chamber for a product to repair the pipes.
  • the body must, however, be positioned exactly at the site where the repair is to be carried out, the site first having been identified by the injection of compressed air.
  • the filler and a catalyst are then separately injected into the empty chamber defined by the inflatable parts and, once the repair has been carried out, the tubular body must again be withdrawn and cleaned for the following repair operation.
  • tubular body in order to use the tubular body, two manholes are required and the tubular body cannot be advanced in a pipe which has internally projecting obstacles. Its rate of displacement is also very low, due to the advancement method used.
  • a repair device for the in situ repair of a pipe by the application of a filler material to the internal wall of the pipe, which device comprises an assembly of at least four short cylindrical, inflatable members, which inflatable members in use define in the pipe a cavity for receiving the filler material, each pair of adjacent inflatable members being connected to one another by an articulated tie rod capable of transmitting a substantial axial force from one said inflatable member to the other whilst permitting the inflatable members to articulate freely with respect to one another, first duct means for conveying an inflating fluid to the inflatable members, and second duct means for conveying said filler material to said cavities.
  • a method of repairing a pipe in situ which comprises, firstly, exploring, by means of a camera, the pipe by topographically recording major faults and placing stops in any lateral pipelines leading into the pipe, then introducing a repair device as defined in the preceding paragraph via a manhole into the pipe, and displacing the repair device along the pipe while maintaining the injection chamber continuously filled with filler material, and stopping the repair device in the region of each of the major faults which were previously recorded, for a sufficiently long time to repair the fault.
  • FIGS. 1A to 1E are longitudinal sections of the various members forming a repair device in accordance with the invention.
  • FIGS. 2A to 2D diagrammatically show the repair device while passing a shoulder in a pipe being repaired.
  • the repair device is essentially formed by an assembly of at least four short cylindrical inflatable members 1, 2, 3, and 4 which are interconnected by tie rods 5.
  • the inflatable members have a length which is less than about one and a half times their diameter, and preferably about the same as their diameter.
  • the tie rods 5 are articulated by each being provided with a cardan joint 6.
  • the inflatable members are connected to means 7 for the supply of pressurized filler material 7' and to means 8 for the supply of inflating fluid, as well as to means 9 for drawing and/or withdrawing them to injection and to drive means respectively, which are located above ground and are provided with corresponding control means.
  • the assembly of members 1, 2, 3, and 4 permits the delimitation in the pipe 11 of a permanent injection chamber 10 for pressurized filler material 7', thus permitting the complete and continuous repair of the pipe during travel of the assembly along the pipe.
  • the assembly of members ensures that the injection chamber 10 is continuously filled with filler material 7'. This is so even in the region of shoulders 12, internal projections 13, connections 14 with secondary pipelines, or bends 12'.
  • the articulated tie rods 5 make it possible, because of the cardan joints 6, to transmit a substantial axial force, which permits the introduction of the inflatable members 1, 2, 3 and 4 and the advancement of the members along the pipe 11, by thrust exerted from behind, in particular when operating in a pipe 11 from a single manhole.
  • the articulated tie rods also make it possible for each inflatable member 1, 2, 3, and 4 to pivot freely in all directions relative to the adjacent member, enabling the assembly of inflatable members to travel through bends of up to 90°.
  • the similarly constructed inflatable members 1, 2, 3, and 4 each comprise a tubular support body 15, in which is disposed, in a fixed manner, a plurality of rigid pipes 16 which project beyond the two ends of the support body.
  • the support body is encircled by an inflatable annular sleeve 17 which has, on the outside thereof, radially extending ribs 18, and is located axially by means of two end plates 19, 19'.
  • the end plates 19, 19' are mounted on the projecting ends of the rigid pipes 16 and are secured by means of detachable fixing means 20.
  • the ribs 18 may be of an elastic materials, such as a polymer or a synthetic rubber, and are formed integrally with the inflatable sleeves 17.
  • the wear to which the ribs are subjected as a result of their contact with the wall may be reduced by coating the ribs with a material by vulcanization.
  • the inflatable annular sleeve 17 may be changed very readily and rapidly, if it is desired to adapt the inflatable members 1, 2, 3 and 4 to a pipe 11 having a particular diameter, by removing one of the two end plates 19 or 19', once the fixing means 20 have been removed.
  • the fixing means 20 may, for example, be in the form of nuts.
  • the articulated tie rods 5, which are of variable length, are preferably firmly fixed, in a detachable manner, to facing end plates 19, 19' of the inflatable members.
  • the outer end plates 19 and 19' of the extreme members 1 and 4 are provided with attachment means for securing the cable 9 or the drawing or withdrawing chain, connected to a winch or similar device located above ground (not illustrated).
  • the winch or similar device is advantageously manually or electrically operated, to minimize noise.
  • the inflating fluid supply means 8 are in the form of flexible pipes which are connected to a compressor device located above ground (not illustrated), which feeds each of the four inflatable members 1, 2, 3, and 4 independently.
  • the supply means 7 for filler material 7' which is prepared above ground and is ready for use, is in the form of a semi-rigid tube 22 connected, by means of a quick coupler 23, to one of the rigid pipes 16 of the rearmost inflatable member 4, the subsequent transfer of filler material 7' into the injection chamber 10 taking place through a connecting tube 24 and a rigid pipe 16 of one of the intermediate inflatable members 2 or 3, which define the injection chamber 10.
  • the length of the injection chamber 10 is directly dependent on the length of the tie rod 5 which connects the inflatable members 2 and 3, and may consequently be adjusted according to the dimension of the fault, such as the fissures 36, that is to be treated.
  • the semi-rigid design of the tube 7 makes it possible, when the pipe 11 is provided with only one manhole, for the assembly of inflatable members 1 to 4 to be introduced by successive thrusts exerted on the tube 7.
  • push rods (not illustrated) may be used to push the assembly of inflatable members through the pipe.
  • the flexible supply pipes 8 for inflating fluid, in particular compressed air, which are made up of pipe sections which are releasably interconnected by means of connectors, may advantageously pass through the interposed inflatable members 4, 3 or 2, via their rigid pipes 16.
  • the preparing and injecting device for the filler material 7' which may include a mixer, a pump, and an air compressor, may advantageously be installed in or on a vehicle, such as a truck or a light delivery van.
  • the repair device also comprises an additional cylindrical scraper member 25 (FIG. 1E) which is provided with at least two inflatable collars 26 and may be connected to the assembly of inflatable members 1 to 4 by means of an articulated tie rod 5. Alternatively, it may be operated separately by being pulled through the repaired pipe 11, once the assembly of inflatable members 1 to 4 has been withdrawn completely.
  • the scraper member 25 may comprise, advantageously, two inflatable collars 26, which are provided on their outer surface with a reinforcing layer 27 and are mounted, if required with the interposition of spacers 28 having a variable length, on a rigid hollow pipe 29. They are held located axially by means of end plates 30, which are mounted on the rigid pipe 29 in such a manner as to be detachable.
  • the scraper member 25 When the scraper member 25 is operated independently, it is drawn through the repaired section of the pipe 11 and moved to and fro by means of one or two pulling cables which are attached via attachment means 31 connected to the ends of the hollow pipe 29, for purposes of smoothing the wall before the filler material 7' sets completely.
  • a further characteristic feature of the invention which is illustrated in FIGS. 1A, 1D, and 1E, is that the repair device may, in addition, be provided with an inspection and position control device which is preferably in the form of small cameras 32 mounted on the extreme members 1 and 4 of the assembly and, if required, on the scraper member 25, and visual display units and control devices arranged above ground, which permit the injection chamber 10 to be placed accurately in the region of relatively large faults and, after repair, to examine the treated sections.
  • an inspection and position control device which is preferably in the form of small cameras 32 mounted on the extreme members 1 and 4 of the assembly and, if required, on the scraper member 25, and visual display units and control devices arranged above ground, which permit the injection chamber 10 to be placed accurately in the region of relatively large faults and, after repair, to examine the treated sections.
  • the repair device is equipped with means for measuring the pressure of the filler material 7' in the region of the injection chamber 10, and comprises a pressure sensor 33 which is connected to evaluating means arranged above ground, the measuring device being able accurately to record the pressure exerted on the wall of the pipe 11, thus helping to avoid excessive pressure which may cause the pipe to burst.
  • connection of the cameras 32 and the pressure sensor 33 to the corresponding measuring and utilization devices arranged above ground is provided by means of connecting lines 34 which pass through the interposed inflatable members 1, 2, 3 or 4, via one of their rigid pipes 16.
  • the invention extends to a method of repairing pipes 11, using a repair device as described above, which method is characterized in that it comprises, firstly, exploring by means of a camera the pipe 11, or the portion of pipe to be treated, by topographically recording major faults and by placing stops 35 in the openings of inlet pipes 14 of secondary pipes which open into the pipe 11, by means of a manipulator arm ahead of the front end camera, then introducing the repair device via a manhole, displacing the repair device along the portion of pipe 11 to be treated, and allowing sufficient stopping time in the region of the major faults which were previously recorded, the injection chamber 10 continuously being filled with filler material 7' during advancement of the repairing device, thus permitting the continuous repair of said pipe and, therefore, also the repair of faults which are, initially, not visible or detectable.
  • the repair operation may proceed either by the device being introduced into the pipe 11 via a first manhole, and by pulling it towards a second manhole by means of a pulling cable 9, or, in the case of a pipe 11 having only one manhole, by placing the device in position at the end of the pipe 11 remote from the manhole, and pulling it backwards by means of a pulling cable 9, in the direction of the manhole.
  • the filler material 7' which is used may advantageously be a thixotropic ready-to-mix mortar, which is water-resistant in the fluid condition as well as in the set condition.
  • the passing of an obstacle by the assembly of inflatable members 1 to 4 is simple to carry out, while keeping the injection chamber 10 full and without involving a discharge of the filler material 7' into the pipe 11, by the successive, partial deflation of the inflatable members 1 to 4 when they pass the region of a projecting obstacle (shoulder 12).
  • the invention thus provides a device for the in situ repair of pipes 11, the interior of which cannot be examined personally, which makes it possible to repair, by the continuous application of filler material 7' to the wall, all sealing faults, whether apparent or not, in respect of a pipe 11 which comprises only one manhole or access and also in respect of a pipe which comprises more than one manhole or access.
  • the device may also be used in the region of bends 12' in the pipe.
  • the repair device may also be used to repair pipes 11 which are subjected to ground water seepage.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)
  • Earth Drilling (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Pipeline Systems (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Design And Manufacture Of Integrated Circuits (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US08/026,976 1992-03-06 1993-03-05 Repair device for the in situ repair of pipes, and a method of repairing pipes Expired - Lifetime US5372162A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9202875A FR2688292B1 (fr) 1992-03-06 1992-03-06 Dispositif de reparation in situ de conduits ou de canalisations non visitables et procede de rehabilitation mettant en óoeuvre ledit dispositif.
FR9202875 1992-03-06

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US5372162A true US5372162A (en) 1994-12-13

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US (1) US5372162A (de)
EP (1) EP0559592B1 (de)
AT (1) ATE129061T1 (de)
DE (2) DE69300605T2 (de)
DK (1) DK0559592T3 (de)
ES (1) ES2081196T3 (de)
FR (1) FR2688292B1 (de)
ZA (1) ZA931265B (de)

Cited By (37)

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Publication number Priority date Publication date Assignee Title
US5497807A (en) * 1993-03-10 1996-03-12 British Gas Plc Apparatus for introducing sealant into a clearance between an existing pipe and a replacement pipe
US5794662A (en) * 1995-08-18 1998-08-18 St Onge Henri S Pipe liner and method of installation
US6176644B1 (en) * 1995-10-24 2001-01-23 Mark L. Boyer Pipe rehabilitation test mandrel
US6250955B1 (en) 1999-12-17 2001-06-26 David Archuleta Pigtailed scotchcast assembly
KR20010079415A (ko) * 2001-07-13 2001-08-22 김윤수 관로 부분보수 장비 및 공법
US6354330B1 (en) * 1993-06-12 2002-03-12 Insituform (Netherlands) B.V. Lining of pipelines with a flexible lining including a heat curable resin by curling in stages
US6446669B1 (en) * 2001-01-04 2002-09-10 Philip L. Lundman Pipe sealing apparatus
US6494437B1 (en) 1995-10-24 2002-12-17 Mark L. Boyer Boom mounted winch
US20030047276A1 (en) * 2001-09-10 2003-03-13 Alcatel Method of installing a tubular member in a cavity inaccessible to an operator
US20030066844A1 (en) * 2001-10-09 2003-04-10 Stewart Boal Inflatable and collapsible apparatus for dispensing fluid from a fluid vessel
US20040011415A1 (en) * 2002-07-15 2004-01-22 Bj Services Company Compression pipe repairing and reinforcing methods
US20040242056A1 (en) * 2003-05-28 2004-12-02 David Archuleta Pigtailed scotchcast assembly
US20060037659A1 (en) * 2002-09-04 2006-02-23 Gillam Terence D Inflatable pipe test probe
US20070113622A1 (en) * 2005-11-22 2007-05-24 Tdw Delaware, Inc. Methods and systems for hydrostatic testing a pipeline
US20080163951A1 (en) * 2007-01-10 2008-07-10 Lundman Philip L Inflatable plug with flange
US20090114302A1 (en) * 2007-11-07 2009-05-07 Tdw Delaware, Inc. Double Block and Bleed Plug
US20090152480A1 (en) * 2007-12-13 2009-06-18 Patrick Savaria Fluid backup preventing system, and method of use thereof
US20100116372A1 (en) * 2007-01-01 2010-05-13 Samuel Perstnev Method of repairing leakage in pipelines
US20110005615A1 (en) * 2007-12-13 2011-01-13 Patrick Savaria Fluid backup preventing system, and method of use thereof
US20110318111A1 (en) * 2010-06-28 2011-12-29 Myung Ja Han Total environmentally-friendly trenchless repairing method
US8596917B2 (en) 2010-05-13 2013-12-03 Structural Group, Inc. System for repairing and strengthening pipe with internal helically wound tensile reinforcement
US20140026978A1 (en) * 2007-12-13 2014-01-30 7525443 Canada Inc. Fluid Backup Preventing System and Method of Use Thereof
US20160083953A1 (en) * 2007-12-13 2016-03-24 7525443 Canada Inc. Fluid Backflow Management System and Method of Use Thereof
CN109210315A (zh) * 2017-07-01 2019-01-15 健管（厦门）环境科技有限公司 一种短管连接的非开挖管道修复装置及修复工艺
CN110894902A (zh) * 2019-12-31 2020-03-20 中国人民解放军92578部队 一种气动管内伸缩爬行机器人
US10884232B1 (en) 2019-12-30 2021-01-05 General Electric Company Insertion apparatus including rigidizable body
CN114607869A (zh) * 2022-03-14 2022-06-10 河北元丰管道工程有限公司 一种具有凹陷修复功能的保温钢管结构及其修复方法
US11492818B1 (en) * 2021-01-23 2022-11-08 Julian McVay Post repair and reinforcement apparatus
US11613003B2 (en) 2020-01-24 2023-03-28 General Electric Company Line assembly for an extension tool having a plurality of links
US11654547B2 (en) 2021-03-31 2023-05-23 General Electric Company Extension tool
US11692650B2 (en) 2020-01-23 2023-07-04 General Electric Company Selectively flexible extension tool
US11702955B2 (en) 2019-01-14 2023-07-18 General Electric Company Component repair system and method
US11707819B2 (en) 2018-10-15 2023-07-25 General Electric Company Selectively flexible extension tool
US11752622B2 (en) 2020-01-23 2023-09-12 General Electric Company Extension tool having a plurality of links
US11834990B2 (en) 2020-03-10 2023-12-05 Oliver Crispin Robotics Limited Insertion tool
US12060963B1 (en) * 2023-04-19 2024-08-13 Danny Warren Consulting, LLC. Method and system for encapsulating in-ground asbestos concrete pipe
US12091981B2 (en) 2020-06-11 2024-09-17 General Electric Company Insertion tool and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2852661B1 (fr) 2003-03-18 2006-01-27 Andre Frey Dispositif de rehabilitation in situ de canalisations non visitables

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GB191216950A (en) * 1912-07-20 1913-03-13 Thomas James Sims Improved Apparatus for Joining and Repairing Drain and other similar Pipes.
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GB990622A (en) * 1964-04-16 1965-04-28 Penetryn System Sleeve packer for chemical grouting
FR1398057A (fr) * 1964-03-25 1965-05-07 Appareil pour le chemisage de conduits
US3356777A (en) * 1964-08-10 1967-12-05 Phillips Petroleum Co Method and means for sealing leaks in buried conduits
US3885521A (en) * 1972-05-24 1975-05-27 Arx Paul Von Apparatus for coating the inner wall surface of a duct
US3958607A (en) * 1974-08-29 1976-05-25 The Penetryn System, Inc. Apparatus for sealing pipe leaks
FR2461189A1 (fr) * 1979-07-09 1981-01-30 Pronal Sa Procede et appareillage pour l'obturation d'une conduite de transport de fluide
US4272984A (en) * 1979-05-18 1981-06-16 Interprovincial Steel And Pipe Corporation, Ltd. Pipeline leak detection method and control device therefor
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EP0146331A1 (de) * 1983-12-16 1985-06-26 I.P.D. Systems Limited Vorrichtung und Verfahren zum Entfernen von Unregelmässigkeiten in oder zum Aufweiten von unterirdischen Rohrleitungen
GB2171486A (en) * 1985-02-04 1986-08-28 Bicc Plc Repairing drains and underground pipes
FR2579294A1 (fr) * 1985-03-21 1986-09-26 Socea Balency Dispositif pour la refection in situ de canalisations, en particulier d'egouts, non visitables
WO1987003353A1 (en) * 1985-11-25 1987-06-04 Entreprenadaktiebolaget E. & G. Jönsson Method for restoring underground pipelines
US4691728A (en) * 1986-05-28 1987-09-08 Cherne Industries, Inc. Electronic test and seal apparatus and method
US4848964A (en) * 1986-05-23 1989-07-18 I.P.D. Systems Limited Apparatus for correcting irregularities in or enlarging an underground duct
US4898498A (en) * 1987-12-07 1990-02-06 Kabushiki Kaisha Iseki Kaihatsu Koki Thrust transmitting device
US4954016A (en) * 1988-04-13 1990-09-04 Oy Wiik & Hoglund Ag Sewer pipe relining method
US4955755A (en) * 1988-06-10 1990-09-11 Frey Andre F Device for the in situ repair of a pipe
DE9109334U1 (de) * 1990-08-17 1991-09-19 Kühner, Uwe, 7000 Stuttgart Vorrichtung zum Auskleiden von Rohrleitungen mit einer Innenbeschichtung
US5195392A (en) * 1990-05-14 1993-03-23 Niagara Mohawk Power Corporation Internal pipe inspection system

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US3125464A (en) * 1964-03-17 Figure
GB191216950A (en) * 1912-07-20 1913-03-13 Thomas James Sims Improved Apparatus for Joining and Repairing Drain and other similar Pipes.
US2851061A (en) * 1957-12-26 1958-09-09 Louis A Bernard Device for sealing sewer pipe lines
US3058137A (en) * 1960-01-13 1962-10-16 Earl N Doyle Pipe line treating apparatus
FR1398057A (fr) * 1964-03-25 1965-05-07 Appareil pour le chemisage de conduits
GB990622A (en) * 1964-04-16 1965-04-28 Penetryn System Sleeve packer for chemical grouting
US3356777A (en) * 1964-08-10 1967-12-05 Phillips Petroleum Co Method and means for sealing leaks in buried conduits
US3885521A (en) * 1972-05-24 1975-05-27 Arx Paul Von Apparatus for coating the inner wall surface of a duct
US3958607A (en) * 1974-08-29 1976-05-25 The Penetryn System, Inc. Apparatus for sealing pipe leaks
US4272984A (en) * 1979-05-18 1981-06-16 Interprovincial Steel And Pipe Corporation, Ltd. Pipeline leak detection method and control device therefor
FR2461189A1 (fr) * 1979-07-09 1981-01-30 Pronal Sa Procede et appareillage pour l'obturation d'une conduite de transport de fluide
US4314577A (en) * 1979-07-09 1982-02-09 Brister Beryle D Installation, hydrostatic testing, repair and modification of large diameter fluid transmission lines
US4371569A (en) * 1979-11-22 1983-02-01 Saibu Gas Co. Ltd. Method for reinforcing and repairing piping
US4377984A (en) * 1981-03-13 1983-03-29 Spiniello Construction Company Connecting assembly for pipe lining equipment
US4449584A (en) * 1982-08-12 1984-05-22 Byron Christensen Inflatable flowing hole plug
US4429720A (en) * 1982-09-23 1984-02-07 Beck Richard D Apparatus for seeking out and repairing leaks in pipes
EP0146331A1 (de) * 1983-12-16 1985-06-26 I.P.D. Systems Limited Vorrichtung und Verfahren zum Entfernen von Unregelmässigkeiten in oder zum Aufweiten von unterirdischen Rohrleitungen
GB2171486A (en) * 1985-02-04 1986-08-28 Bicc Plc Repairing drains and underground pipes
FR2579294A1 (fr) * 1985-03-21 1986-09-26 Socea Balency Dispositif pour la refection in situ de canalisations, en particulier d'egouts, non visitables
WO1987003353A1 (en) * 1985-11-25 1987-06-04 Entreprenadaktiebolaget E. & G. Jönsson Method for restoring underground pipelines
US4848964A (en) * 1986-05-23 1989-07-18 I.P.D. Systems Limited Apparatus for correcting irregularities in or enlarging an underground duct
US4691728A (en) * 1986-05-28 1987-09-08 Cherne Industries, Inc. Electronic test and seal apparatus and method
US4898498A (en) * 1987-12-07 1990-02-06 Kabushiki Kaisha Iseki Kaihatsu Koki Thrust transmitting device
US4954016A (en) * 1988-04-13 1990-09-04 Oy Wiik & Hoglund Ag Sewer pipe relining method
US4955755A (en) * 1988-06-10 1990-09-11 Frey Andre F Device for the in situ repair of a pipe
US5195392A (en) * 1990-05-14 1993-03-23 Niagara Mohawk Power Corporation Internal pipe inspection system
DE9109334U1 (de) * 1990-08-17 1991-09-19 Kühner, Uwe, 7000 Stuttgart Vorrichtung zum Auskleiden von Rohrleitungen mit einer Innenbeschichtung

Cited By (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6056016A (en) * 1993-03-10 2000-05-02 British Gas Plc Method for introducing a sealant into a clearance formed between a replacement pipe and an existing pipe within which the replacement pipe is located
US5497807A (en) * 1993-03-10 1996-03-12 British Gas Plc Apparatus for introducing sealant into a clearance between an existing pipe and a replacement pipe
US6354330B1 (en) * 1993-06-12 2002-03-12 Insituform (Netherlands) B.V. Lining of pipelines with a flexible lining including a heat curable resin by curling in stages
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DE69300605T2 (de) 1996-05-30
DE69300605D1 (de) 1995-11-16
ZA931265B (en) 1994-08-23
EP0559592B1 (de) 1995-10-11
FR2688292A1 (fr) 1993-09-10
DE559592T1 (de) 1994-04-28
DK0559592T3 (da) 1996-02-19
ES2081196T3 (es) 1996-02-16
EP0559592A1 (de) 1993-09-08
FR2688292B1 (fr) 1995-07-13
ATE129061T1 (de) 1995-10-15

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